Plunger covers and plungers for use in syringes and methods of fabricating plunger covers and plungers for use in syringes
First Claim
Patent Images
1. A plunger cover for use with a syringe comprising:
- a sealing portion adapted to form a seal with the syringe; and
a central portion adapted to contact a fluid within the syringe, the central portion being more rigid than the sealing portion, the sealing portion and the central portion being connected in an overmolding process,wherein the sealing portion is injection molded first and the central portion is injection overmolded thereon,wherein the central portion comprises a conical hollow portionwherein the sealing portion comprises a conical central section, andwherein the sealing portion and the central portion are overmolded such that the conical central section and the conical hollow portion are coextensively connected to form a multilayer conical portion of the plunger cover.
3 Assignments
0 Petitions
Accused Products
Abstract
A plunger cover for use with a syringe includes a sealing portion adapted to form a seal with the syringe and a central portion adapted to contact fluid within the syringe. The central portion can, for example, be more rigid than the sealing portion. The sealing portion and the central portion are connected in an overmolding process. The sealing portion can, for example, be formed from a thermoplastic elastomer or a thermoplastic polyurethane. The central portion can, for example, be formed from polypropylene, acrylonitrile butadiene styrene, polycarbonate or copolymers thereof.
35 Citations
18 Claims
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1. A plunger cover for use with a syringe comprising:
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a sealing portion adapted to form a seal with the syringe; and a central portion adapted to contact a fluid within the syringe, the central portion being more rigid than the sealing portion, the sealing portion and the central portion being connected in an overmolding process, wherein the sealing portion is injection molded first and the central portion is injection overmolded thereon, wherein the central portion comprises a conical hollow portion wherein the sealing portion comprises a conical central section, and wherein the sealing portion and the central portion are overmolded such that the conical central section and the conical hollow portion are coextensively connected to form a multilayer conical portion of the plunger cover. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A plunger for use with a syringe comprising:
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a plunger cover comprising a sealing portion adapted to form a seal with the syringe and a central portion adapted to contact a fluid within the syringe, the central portion being more rigid than the sealing portion, the sealing portion and the central portion being connected in an overmolding process; and a support ring attached to the plunger cover, wherein the support ring has a forward surface shaped to contact and mate with a rearward surface of the plunger cover, wherein the central portion of the plunger cover comprises a conical hollow portion, wherein the sealing portion of the plunger cover comprises a conical central section, and wherein the sealing portion and the central portion are overmolded such that the conical central section and the conical hollow portion are coextensively connected to form a multilayer conical portion of the plunger cover. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A syringe comprising:
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a syringe body and a plunger slidably positioned within the syringe body, the plunger comprising a plunger cover comprising; a sealing portion adapted to form a seal with the syringe body; a central portion adapted to contact a fluid within the syringe, the central portion being more rigid than the sealing portion, the sealing portion and the central portion being connected in an overmolding process; and a support ring attached to the plunger cover, wherein the sealing portion is injection molded first and the central portion is injection molded thereon, wherein the support ring has a forward surface shaped to contact and mate with a rearward surface of the plunger cover, wherein the central portion comprises a conical hollow portion, wherein the sealing portion comprises a conical central section, and wherein the sealing portion and the central portion are overmolded such that the conical central section and the conical hollow portion are coextensively connected to form a multilayer conical portion of the plunger cover.
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16. A method of fabricating a plunger cover for use in a syringe, the method comprising:
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molding a sealing portion adapted to form a seal with the syringe; molding a central portion adapted to contact a fluid within the syringe; and connecting the sealing portion and the central portion in an overmolding process, the central portion being more rigid than the sealing portion, wherein the central portion comprises a conical hollow portion, and wherein the sealing portion comprises a conical central section, and wherein the sealing portion and the central portion are overmolded such that the conical central section and the conical hollow portion are coextensively connected to form a multilayer conical portion of the plunger cover. - View Dependent Claims (17)
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18. A plunger cover for use with a syringe comprising:
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a sealing portion adapted to form a seal with the syringe and a central portion adapted to contact fluid within the syringe, the central portion having at least one physiochemical property that differs from the sealing portion, the sealing portion and the central portion being connected in an overmolding process, wherein the central portion is overmolded upon the sealing portion, wherein the central portion comprises a conical hollow portion, wherein the sealing portion comprises a conical central section, and wherein the sealing portion and central portion are overmolded such that the conical central section and the conical hollow portion are coextensively connected to form a multilayer conical portion of the plunger cover.
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Specification